The deep , near-infrared narrow-band survey HiZELS has yielded robust samples of H \alpha -emitting star-forming galaxies within narrow redshift slices at z = 0.8 , 1.47 and 2.23 .
In this paper , we distinguish the stellar mass and star-formation rate ( SFR ) dependence of the clustering of these galaxies .
At high stellar masses ( M _ { * } / M _ { \odot } \gtrsim 2 \times 10 ^ { 10 } ) , where HiZELS selects galaxies close to the so-called star-forming main sequence , the clustering strength is observed to increase strongly with stellar mass ( in line with the results of previous studies of mass-selected galaxy samples ) and also with SFR .
These two dependencies are shown to hold independently .
At lower stellar masses , however , where HiZELS probes high specific SFR galaxies , there is little or no dependence of the clustering strength on stellar mass , but the dependence on SFR remains : high-SFR low-mass galaxies are found in more massive dark matter haloes than their lower SFR counterparts .
We argue that this is due to environmentally driven star formation in these systems .
We apply the same selection criteria to the EAGLE cosmological hydrodynamical simulations .
We find that , in EAGLE , the high-SFR low-mass galaxies are central galaxies in more massive dark matter haloes , in which the high SFRs are driven by a ( halo-driven ) increased gas content .